i will offer 3.6 bil as you do not have hardly any support skills such as power grid management, only barge 4, few mining crystal skills. This toon needs work. Isk ready, eve mail or reply here.
its not worth 6 bil. if you go off of extractors its only around 2.4 bil. you have barge 4 and mining upgrades 4. You can buy hulk toons for less than 6 bil.
you can extract 6 injectors at around 700 mil each. That would be 4.2 bil max and that isnt even factoring in cost of the extractors. if you subtract those it comes to around 2.4 bil. 3 11-12 mil sp hulk toons sold for 6 bil each today. At most this toon is work 3.5 to 4 bil. I have no idea how you think you can get 5.6 with extracting skills or its worth 6 bil.
Proof of ownership of the character comes in the form of the character that is being sold making the sales thread in which people can bid for it. Welcome to the Character Bazaar
Please post with the character being sold, additionally the character linked only has 8.2m SP not 8.3m SP